1 /* 2 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 */ 32 #include <linux/kernel.h> 33 #include <linux/slab.h> 34 #include <linux/mm.h> 35 #include <linux/scatterlist.h> 36 #include <linux/kfifo.h> 37 #include <scsi/scsi_cmnd.h> 38 #include <scsi/scsi_host.h> 39 40 #include "iscsi_iser.h" 41 42 /* Constant PDU lengths calculations */ 43 #define ISER_TOTAL_HEADERS_LEN (sizeof (struct iser_hdr) + \ 44 sizeof (struct iscsi_hdr)) 45 46 /* iser_dto_add_regd_buff - increments the reference count for * 47 * the registered buffer & adds it to the DTO object */ 48 static void iser_dto_add_regd_buff(struct iser_dto *dto, 49 struct iser_regd_buf *regd_buf, 50 unsigned long use_offset, 51 unsigned long use_size) 52 { 53 int add_idx; 54 55 atomic_inc(®d_buf->ref_count); 56 57 add_idx = dto->regd_vector_len; 58 dto->regd[add_idx] = regd_buf; 59 dto->used_sz[add_idx] = use_size; 60 dto->offset[add_idx] = use_offset; 61 62 dto->regd_vector_len++; 63 } 64 65 /* Register user buffer memory and initialize passive rdma 66 * dto descriptor. Total data size is stored in 67 * iser_task->data[ISER_DIR_IN].data_len 68 */ 69 static int iser_prepare_read_cmd(struct iscsi_task *task, 70 unsigned int edtl) 71 72 { 73 struct iscsi_iser_task *iser_task = task->dd_data; 74 struct iser_regd_buf *regd_buf; 75 int err; 76 struct iser_hdr *hdr = &iser_task->desc.iser_header; 77 struct iser_data_buf *buf_in = &iser_task->data[ISER_DIR_IN]; 78 79 err = iser_dma_map_task_data(iser_task, 80 buf_in, 81 ISER_DIR_IN, 82 DMA_FROM_DEVICE); 83 if (err) 84 return err; 85 86 if (edtl > iser_task->data[ISER_DIR_IN].data_len) { 87 iser_err("Total data length: %ld, less than EDTL: " 88 "%d, in READ cmd BHS itt: %d, conn: 0x%p\n", 89 iser_task->data[ISER_DIR_IN].data_len, edtl, 90 task->itt, iser_task->iser_conn); 91 return -EINVAL; 92 } 93 94 err = iser_reg_rdma_mem(iser_task,ISER_DIR_IN); 95 if (err) { 96 iser_err("Failed to set up Data-IN RDMA\n"); 97 return err; 98 } 99 regd_buf = &iser_task->rdma_regd[ISER_DIR_IN]; 100 101 hdr->flags |= ISER_RSV; 102 hdr->read_stag = cpu_to_be32(regd_buf->reg.rkey); 103 hdr->read_va = cpu_to_be64(regd_buf->reg.va); 104 105 iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n", 106 task->itt, regd_buf->reg.rkey, 107 (unsigned long long)regd_buf->reg.va); 108 109 return 0; 110 } 111 112 /* Register user buffer memory and initialize passive rdma 113 * dto descriptor. Total data size is stored in 114 * task->data[ISER_DIR_OUT].data_len 115 */ 116 static int 117 iser_prepare_write_cmd(struct iscsi_task *task, 118 unsigned int imm_sz, 119 unsigned int unsol_sz, 120 unsigned int edtl) 121 { 122 struct iscsi_iser_task *iser_task = task->dd_data; 123 struct iser_regd_buf *regd_buf; 124 int err; 125 struct iser_dto *send_dto = &iser_task->desc.dto; 126 struct iser_hdr *hdr = &iser_task->desc.iser_header; 127 struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT]; 128 129 err = iser_dma_map_task_data(iser_task, 130 buf_out, 131 ISER_DIR_OUT, 132 DMA_TO_DEVICE); 133 if (err) 134 return err; 135 136 if (edtl > iser_task->data[ISER_DIR_OUT].data_len) { 137 iser_err("Total data length: %ld, less than EDTL: %d, " 138 "in WRITE cmd BHS itt: %d, conn: 0x%p\n", 139 iser_task->data[ISER_DIR_OUT].data_len, 140 edtl, task->itt, task->conn); 141 return -EINVAL; 142 } 143 144 err = iser_reg_rdma_mem(iser_task,ISER_DIR_OUT); 145 if (err != 0) { 146 iser_err("Failed to register write cmd RDMA mem\n"); 147 return err; 148 } 149 150 regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT]; 151 152 if (unsol_sz < edtl) { 153 hdr->flags |= ISER_WSV; 154 hdr->write_stag = cpu_to_be32(regd_buf->reg.rkey); 155 hdr->write_va = cpu_to_be64(regd_buf->reg.va + unsol_sz); 156 157 iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X " 158 "VA:%#llX + unsol:%d\n", 159 task->itt, regd_buf->reg.rkey, 160 (unsigned long long)regd_buf->reg.va, unsol_sz); 161 } 162 163 if (imm_sz > 0) { 164 iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n", 165 task->itt, imm_sz); 166 iser_dto_add_regd_buff(send_dto, 167 regd_buf, 168 0, 169 imm_sz); 170 } 171 172 return 0; 173 } 174 175 /** 176 * iser_post_receive_control - allocates, initializes and posts receive DTO. 177 */ 178 static int iser_post_receive_control(struct iscsi_conn *conn) 179 { 180 struct iscsi_iser_conn *iser_conn = conn->dd_data; 181 struct iser_desc *rx_desc; 182 struct iser_regd_buf *regd_hdr; 183 struct iser_regd_buf *regd_data; 184 struct iser_dto *recv_dto = NULL; 185 struct iser_device *device = iser_conn->ib_conn->device; 186 int rx_data_size, err = 0; 187 188 rx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO); 189 if (rx_desc == NULL) { 190 iser_err("Failed to alloc desc for post recv\n"); 191 return -ENOMEM; 192 } 193 rx_desc->type = ISCSI_RX; 194 195 /* for the login sequence we must support rx of upto 8K; login is done 196 * after conn create/bind (connect) and conn stop/bind (reconnect), 197 * what's common for both schemes is that the connection is not started 198 */ 199 if (conn->c_stage != ISCSI_CONN_STARTED) 200 rx_data_size = ISCSI_DEF_MAX_RECV_SEG_LEN; 201 else /* FIXME till user space sets conn->max_recv_dlength correctly */ 202 rx_data_size = 128; 203 204 rx_desc->data = kmalloc(rx_data_size, GFP_NOIO); 205 if (rx_desc->data == NULL) { 206 iser_err("Failed to alloc data buf for post recv\n"); 207 err = -ENOMEM; 208 goto post_rx_kmalloc_failure; 209 } 210 211 recv_dto = &rx_desc->dto; 212 recv_dto->ib_conn = iser_conn->ib_conn; 213 recv_dto->regd_vector_len = 0; 214 215 regd_hdr = &rx_desc->hdr_regd_buf; 216 memset(regd_hdr, 0, sizeof(struct iser_regd_buf)); 217 regd_hdr->device = device; 218 regd_hdr->virt_addr = rx_desc; /* == &rx_desc->iser_header */ 219 regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN; 220 221 iser_reg_single(device, regd_hdr, DMA_FROM_DEVICE); 222 223 iser_dto_add_regd_buff(recv_dto, regd_hdr, 0, 0); 224 225 regd_data = &rx_desc->data_regd_buf; 226 memset(regd_data, 0, sizeof(struct iser_regd_buf)); 227 regd_data->device = device; 228 regd_data->virt_addr = rx_desc->data; 229 regd_data->data_size = rx_data_size; 230 231 iser_reg_single(device, regd_data, DMA_FROM_DEVICE); 232 233 iser_dto_add_regd_buff(recv_dto, regd_data, 0, 0); 234 235 err = iser_post_recv(rx_desc); 236 if (!err) 237 return 0; 238 239 /* iser_post_recv failed */ 240 iser_dto_buffs_release(recv_dto); 241 kfree(rx_desc->data); 242 post_rx_kmalloc_failure: 243 kmem_cache_free(ig.desc_cache, rx_desc); 244 return err; 245 } 246 247 /* creates a new tx descriptor and adds header regd buffer */ 248 static void iser_create_send_desc(struct iscsi_iser_conn *iser_conn, 249 struct iser_desc *tx_desc) 250 { 251 struct iser_regd_buf *regd_hdr = &tx_desc->hdr_regd_buf; 252 struct iser_dto *send_dto = &tx_desc->dto; 253 254 memset(regd_hdr, 0, sizeof(struct iser_regd_buf)); 255 regd_hdr->device = iser_conn->ib_conn->device; 256 regd_hdr->virt_addr = tx_desc; /* == &tx_desc->iser_header */ 257 regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN; 258 259 send_dto->ib_conn = iser_conn->ib_conn; 260 send_dto->notify_enable = 1; 261 send_dto->regd_vector_len = 0; 262 263 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr)); 264 tx_desc->iser_header.flags = ISER_VER; 265 266 iser_dto_add_regd_buff(send_dto, regd_hdr, 0, 0); 267 } 268 269 /** 270 * iser_conn_set_full_featured_mode - (iSER API) 271 */ 272 int iser_conn_set_full_featured_mode(struct iscsi_conn *conn) 273 { 274 struct iscsi_iser_conn *iser_conn = conn->dd_data; 275 276 int i; 277 /* no need to keep it in a var, we are after login so if this should 278 * be negotiated, by now the result should be available here */ 279 int initial_post_recv_bufs_num = ISER_MAX_RX_MISC_PDUS; 280 281 iser_dbg("Initially post: %d\n", initial_post_recv_bufs_num); 282 283 /* Check that there is no posted recv or send buffers left - */ 284 /* they must be consumed during the login phase */ 285 BUG_ON(atomic_read(&iser_conn->ib_conn->post_recv_buf_count) != 0); 286 BUG_ON(atomic_read(&iser_conn->ib_conn->post_send_buf_count) != 0); 287 288 /* Initial post receive buffers */ 289 for (i = 0; i < initial_post_recv_bufs_num; i++) { 290 if (iser_post_receive_control(conn) != 0) { 291 iser_err("Failed to post recv bufs at:%d conn:0x%p\n", 292 i, conn); 293 return -ENOMEM; 294 } 295 } 296 iser_dbg("Posted %d post recv bufs, conn:0x%p\n", i, conn); 297 return 0; 298 } 299 300 static int 301 iser_check_xmit(struct iscsi_conn *conn, void *task) 302 { 303 struct iscsi_iser_conn *iser_conn = conn->dd_data; 304 305 if (atomic_read(&iser_conn->ib_conn->post_send_buf_count) == 306 ISER_QP_MAX_REQ_DTOS) { 307 iser_dbg("%ld can't xmit task %p\n",jiffies,task); 308 return -ENOBUFS; 309 } 310 return 0; 311 } 312 313 314 /** 315 * iser_send_command - send command PDU 316 */ 317 int iser_send_command(struct iscsi_conn *conn, 318 struct iscsi_task *task) 319 { 320 struct iscsi_iser_conn *iser_conn = conn->dd_data; 321 struct iscsi_iser_task *iser_task = task->dd_data; 322 struct iser_dto *send_dto = NULL; 323 unsigned long edtl; 324 int err = 0; 325 struct iser_data_buf *data_buf; 326 327 struct iscsi_cmd *hdr = task->hdr; 328 struct scsi_cmnd *sc = task->sc; 329 330 if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) { 331 iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn); 332 return -EPERM; 333 } 334 if (iser_check_xmit(conn, task)) 335 return -ENOBUFS; 336 337 edtl = ntohl(hdr->data_length); 338 339 /* build the tx desc regd header and add it to the tx desc dto */ 340 iser_task->desc.type = ISCSI_TX_SCSI_COMMAND; 341 send_dto = &iser_task->desc.dto; 342 send_dto->task = iser_task; 343 iser_create_send_desc(iser_conn, &iser_task->desc); 344 345 if (hdr->flags & ISCSI_FLAG_CMD_READ) 346 data_buf = &iser_task->data[ISER_DIR_IN]; 347 else 348 data_buf = &iser_task->data[ISER_DIR_OUT]; 349 350 if (scsi_sg_count(sc)) { /* using a scatter list */ 351 data_buf->buf = scsi_sglist(sc); 352 data_buf->size = scsi_sg_count(sc); 353 } 354 355 data_buf->data_len = scsi_bufflen(sc); 356 357 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 358 err = iser_prepare_read_cmd(task, edtl); 359 if (err) 360 goto send_command_error; 361 } 362 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) { 363 err = iser_prepare_write_cmd(task, 364 task->imm_count, 365 task->imm_count + 366 task->unsol_count, 367 edtl); 368 if (err) 369 goto send_command_error; 370 } 371 372 iser_reg_single(iser_conn->ib_conn->device, 373 send_dto->regd[0], DMA_TO_DEVICE); 374 375 if (iser_post_receive_control(conn) != 0) { 376 iser_err("post_recv failed!\n"); 377 err = -ENOMEM; 378 goto send_command_error; 379 } 380 381 iser_task->status = ISER_TASK_STATUS_STARTED; 382 383 err = iser_post_send(&iser_task->desc); 384 if (!err) 385 return 0; 386 387 send_command_error: 388 iser_dto_buffs_release(send_dto); 389 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err); 390 return err; 391 } 392 393 /** 394 * iser_send_data_out - send data out PDU 395 */ 396 int iser_send_data_out(struct iscsi_conn *conn, 397 struct iscsi_task *task, 398 struct iscsi_data *hdr) 399 { 400 struct iscsi_iser_conn *iser_conn = conn->dd_data; 401 struct iscsi_iser_task *iser_task = task->dd_data; 402 struct iser_desc *tx_desc = NULL; 403 struct iser_dto *send_dto = NULL; 404 unsigned long buf_offset; 405 unsigned long data_seg_len; 406 uint32_t itt; 407 int err = 0; 408 409 if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) { 410 iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn); 411 return -EPERM; 412 } 413 414 if (iser_check_xmit(conn, task)) 415 return -ENOBUFS; 416 417 itt = (__force uint32_t)hdr->itt; 418 data_seg_len = ntoh24(hdr->dlength); 419 buf_offset = ntohl(hdr->offset); 420 421 iser_dbg("%s itt %d dseg_len %d offset %d\n", 422 __func__,(int)itt,(int)data_seg_len,(int)buf_offset); 423 424 tx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO); 425 if (tx_desc == NULL) { 426 iser_err("Failed to alloc desc for post dataout\n"); 427 return -ENOMEM; 428 } 429 430 tx_desc->type = ISCSI_TX_DATAOUT; 431 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr)); 432 433 /* build the tx desc regd header and add it to the tx desc dto */ 434 send_dto = &tx_desc->dto; 435 send_dto->task = iser_task; 436 iser_create_send_desc(iser_conn, tx_desc); 437 438 iser_reg_single(iser_conn->ib_conn->device, 439 send_dto->regd[0], DMA_TO_DEVICE); 440 441 /* all data was registered for RDMA, we can use the lkey */ 442 iser_dto_add_regd_buff(send_dto, 443 &iser_task->rdma_regd[ISER_DIR_OUT], 444 buf_offset, 445 data_seg_len); 446 447 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) { 448 iser_err("Offset:%ld & DSL:%ld in Data-Out " 449 "inconsistent with total len:%ld, itt:%d\n", 450 buf_offset, data_seg_len, 451 iser_task->data[ISER_DIR_OUT].data_len, itt); 452 err = -EINVAL; 453 goto send_data_out_error; 454 } 455 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n", 456 itt, buf_offset, data_seg_len); 457 458 459 err = iser_post_send(tx_desc); 460 if (!err) 461 return 0; 462 463 send_data_out_error: 464 iser_dto_buffs_release(send_dto); 465 kmem_cache_free(ig.desc_cache, tx_desc); 466 iser_err("conn %p failed err %d\n",conn, err); 467 return err; 468 } 469 470 int iser_send_control(struct iscsi_conn *conn, 471 struct iscsi_task *task) 472 { 473 struct iscsi_iser_conn *iser_conn = conn->dd_data; 474 struct iscsi_iser_task *iser_task = task->dd_data; 475 struct iser_desc *mdesc = &iser_task->desc; 476 struct iser_dto *send_dto = NULL; 477 unsigned long data_seg_len; 478 int err = 0; 479 struct iser_regd_buf *regd_buf; 480 struct iser_device *device; 481 482 if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) { 483 iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn); 484 return -EPERM; 485 } 486 487 if (iser_check_xmit(conn, task)) 488 return -ENOBUFS; 489 490 /* build the tx desc regd header and add it to the tx desc dto */ 491 mdesc->type = ISCSI_TX_CONTROL; 492 send_dto = &mdesc->dto; 493 send_dto->task = NULL; 494 iser_create_send_desc(iser_conn, mdesc); 495 496 device = iser_conn->ib_conn->device; 497 498 iser_reg_single(device, send_dto->regd[0], DMA_TO_DEVICE); 499 500 data_seg_len = ntoh24(task->hdr->dlength); 501 502 if (data_seg_len > 0) { 503 regd_buf = &mdesc->data_regd_buf; 504 memset(regd_buf, 0, sizeof(struct iser_regd_buf)); 505 regd_buf->device = device; 506 regd_buf->virt_addr = task->data; 507 regd_buf->data_size = task->data_count; 508 iser_reg_single(device, regd_buf, 509 DMA_TO_DEVICE); 510 iser_dto_add_regd_buff(send_dto, regd_buf, 511 0, 512 data_seg_len); 513 } 514 515 if (iser_post_receive_control(conn) != 0) { 516 iser_err("post_rcv_buff failed!\n"); 517 err = -ENOMEM; 518 goto send_control_error; 519 } 520 521 err = iser_post_send(mdesc); 522 if (!err) 523 return 0; 524 525 send_control_error: 526 iser_dto_buffs_release(send_dto); 527 iser_err("conn %p failed err %d\n",conn, err); 528 return err; 529 } 530 531 /** 532 * iser_rcv_dto_completion - recv DTO completion 533 */ 534 void iser_rcv_completion(struct iser_desc *rx_desc, 535 unsigned long dto_xfer_len) 536 { 537 struct iser_dto *dto = &rx_desc->dto; 538 struct iscsi_iser_conn *conn = dto->ib_conn->iser_conn; 539 struct iscsi_task *task; 540 struct iscsi_iser_task *iser_task; 541 struct iscsi_hdr *hdr; 542 char *rx_data = NULL; 543 int rx_data_len = 0; 544 unsigned char opcode; 545 546 hdr = &rx_desc->iscsi_header; 547 548 iser_dbg("op 0x%x itt 0x%x\n", hdr->opcode,hdr->itt); 549 550 if (dto_xfer_len > ISER_TOTAL_HEADERS_LEN) { /* we have data */ 551 rx_data_len = dto_xfer_len - ISER_TOTAL_HEADERS_LEN; 552 rx_data = dto->regd[1]->virt_addr; 553 rx_data += dto->offset[1]; 554 } 555 556 opcode = hdr->opcode & ISCSI_OPCODE_MASK; 557 558 if (opcode == ISCSI_OP_SCSI_CMD_RSP) { 559 spin_lock(&conn->iscsi_conn->session->lock); 560 task = iscsi_itt_to_ctask(conn->iscsi_conn, hdr->itt); 561 if (task) 562 __iscsi_get_task(task); 563 spin_unlock(&conn->iscsi_conn->session->lock); 564 565 if (!task) 566 iser_err("itt can't be matched to task!!! " 567 "conn %p opcode %d itt %d\n", 568 conn->iscsi_conn, opcode, hdr->itt); 569 else { 570 iser_task = task->dd_data; 571 iser_dbg("itt %d task %p\n",hdr->itt, task); 572 iser_task->status = ISER_TASK_STATUS_COMPLETED; 573 iser_task_rdma_finalize(iser_task); 574 iscsi_put_task(task); 575 } 576 } 577 iser_dto_buffs_release(dto); 578 579 iscsi_iser_recv(conn->iscsi_conn, hdr, rx_data, rx_data_len); 580 581 kfree(rx_desc->data); 582 kmem_cache_free(ig.desc_cache, rx_desc); 583 584 /* decrementing conn->post_recv_buf_count only --after-- freeing the * 585 * task eliminates the need to worry on tasks which are completed in * 586 * parallel to the execution of iser_conn_term. So the code that waits * 587 * for the posted rx bufs refcount to become zero handles everything */ 588 atomic_dec(&conn->ib_conn->post_recv_buf_count); 589 } 590 591 void iser_snd_completion(struct iser_desc *tx_desc) 592 { 593 struct iser_dto *dto = &tx_desc->dto; 594 struct iser_conn *ib_conn = dto->ib_conn; 595 struct iscsi_iser_conn *iser_conn = ib_conn->iser_conn; 596 struct iscsi_conn *conn = iser_conn->iscsi_conn; 597 struct iscsi_task *task; 598 int resume_tx = 0; 599 600 iser_dbg("Initiator, Data sent dto=0x%p\n", dto); 601 602 iser_dto_buffs_release(dto); 603 604 if (tx_desc->type == ISCSI_TX_DATAOUT) 605 kmem_cache_free(ig.desc_cache, tx_desc); 606 607 if (atomic_read(&iser_conn->ib_conn->post_send_buf_count) == 608 ISER_QP_MAX_REQ_DTOS) 609 resume_tx = 1; 610 611 atomic_dec(&ib_conn->post_send_buf_count); 612 613 if (resume_tx) { 614 iser_dbg("%ld resuming tx\n",jiffies); 615 scsi_queue_work(conn->session->host, &conn->xmitwork); 616 } 617 618 if (tx_desc->type == ISCSI_TX_CONTROL) { 619 /* this arithmetic is legal by libiscsi dd_data allocation */ 620 task = (void *) ((long)(void *)tx_desc - 621 sizeof(struct iscsi_task)); 622 if (task->hdr->itt == RESERVED_ITT) 623 iscsi_put_task(task); 624 } 625 } 626 627 void iser_task_rdma_init(struct iscsi_iser_task *iser_task) 628 629 { 630 iser_task->status = ISER_TASK_STATUS_INIT; 631 632 iser_task->dir[ISER_DIR_IN] = 0; 633 iser_task->dir[ISER_DIR_OUT] = 0; 634 635 iser_task->data[ISER_DIR_IN].data_len = 0; 636 iser_task->data[ISER_DIR_OUT].data_len = 0; 637 638 memset(&iser_task->rdma_regd[ISER_DIR_IN], 0, 639 sizeof(struct iser_regd_buf)); 640 memset(&iser_task->rdma_regd[ISER_DIR_OUT], 0, 641 sizeof(struct iser_regd_buf)); 642 } 643 644 void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task) 645 { 646 int deferred; 647 int is_rdma_aligned = 1; 648 struct iser_regd_buf *regd; 649 650 /* if we were reading, copy back to unaligned sglist, 651 * anyway dma_unmap and free the copy 652 */ 653 if (iser_task->data_copy[ISER_DIR_IN].copy_buf != NULL) { 654 is_rdma_aligned = 0; 655 iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_IN); 656 } 657 if (iser_task->data_copy[ISER_DIR_OUT].copy_buf != NULL) { 658 is_rdma_aligned = 0; 659 iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_OUT); 660 } 661 662 if (iser_task->dir[ISER_DIR_IN]) { 663 regd = &iser_task->rdma_regd[ISER_DIR_IN]; 664 deferred = iser_regd_buff_release(regd); 665 if (deferred) { 666 iser_err("%d references remain for BUF-IN rdma reg\n", 667 atomic_read(®d->ref_count)); 668 } 669 } 670 671 if (iser_task->dir[ISER_DIR_OUT]) { 672 regd = &iser_task->rdma_regd[ISER_DIR_OUT]; 673 deferred = iser_regd_buff_release(regd); 674 if (deferred) { 675 iser_err("%d references remain for BUF-OUT rdma reg\n", 676 atomic_read(®d->ref_count)); 677 } 678 } 679 680 /* if the data was unaligned, it was already unmapped and then copied */ 681 if (is_rdma_aligned) 682 iser_dma_unmap_task_data(iser_task); 683 } 684 685 void iser_dto_buffs_release(struct iser_dto *dto) 686 { 687 int i; 688 689 for (i = 0; i < dto->regd_vector_len; i++) 690 iser_regd_buff_release(dto->regd[i]); 691 } 692 693